Code

#include <WiFi.h>
#include <time.h>
#include <Adafruit_NeoPixel.h>

#define PixelPin 26

int minutenpixel = 1;
int stundenpixel = 2;
int helligkeit = 150;


const char* ssid     = "DEINWLANNAME";
const char* password = "DEINWLANPASSWORT";

const char* NTP_SERVER = "ch.pool.ntp.org";
const char* TZ_INFO    = "CET-1CEST-2,M3.5.0/02:00:00,M10.5.0/03:00:00";  // enter your time zone (https://remotemonitoringsystems.ca/time-zone-abbreviations.php)

tm timeinfo;
time_t now;
long unsigned lastNTPtime;
unsigned long lastEntryTime;

Adafruit_NeoPixel pixels = Adafruit_NeoPixel(72, PixelPin, NEO_GRB + NEO_KHZ800);


void setup() {
  Serial.begin(115200);
  Serial.println("\n\nNTP Time Test\n");
  WiFi.begin(ssid, password);

  int counter = 0;
  while (WiFi.status() != WL_CONNECTED) {
    delay(200);
    if (++counter > 100) ESP.restart();
    Serial.print ( "." );
  }
  Serial.println("\n\nWiFi connected\n\n");

  configTime(0, 0, NTP_SERVER);
  // See https://github.com/nayarsystems/posix_tz_db/blob/master/zones.csv for Timezone codes for your region
  setenv("TZ", TZ_INFO, 1);

  if (getNTPtime(10)) {  // wait up to 10sec to sync
  } else {
    Serial.println("Time not set");
    ESP.restart();
  }
  showTime(timeinfo);
  lastNTPtime = time(&now);
  lastEntryTime = millis();
}


void loop() {
  // getTimeReducedTraffic(3600);
  getNTPtime(10);
  showTime(timeinfo);
   
  pixels.begin();
  pixels.clear();
  pixels.setPixelColor(minutenpixel, pixels.Color(helligkeit,helligkeit,helligkeit));
  pixels.setPixelColor(stundenpixel, pixels.Color(helligkeit,helligkeit,helligkeit));
  pixels.show();
  delay(1000);
}

bool getNTPtime(int sec) {

  {
    uint32_t start = millis();
    do {
      time(&now);
      localtime_r(&now, &timeinfo);
      Serial.print(".");
      delay(10);
    } while (((millis() - start) <= (1000 * sec)) && (timeinfo.tm_year < (2016 - 1900)));
    if (timeinfo.tm_year <= (2016 - 1900)) return false;  // the NTP call was not successful
    Serial.print("now ");  Serial.println(now);
    char time_output[30];
    strftime(time_output, 30, "%a  %d-%m-%y %T", localtime(&now));
    Serial.println(time_output);
    Serial.println();
  }
  return true;
}

void showTime(tm localTime) {
  Serial.print(localTime.tm_mday);
  Serial.print('/');
  Serial.print(localTime.tm_mon + 1);
  Serial.print('/');
  Serial.print(localTime.tm_year - 100);
  Serial.print('-');
  Serial.print(localTime.tm_hour);
  Serial.print(':');
  Serial.print(localTime.tm_min);
  Serial.print(':');
  Serial.print(localTime.tm_sec);
  Serial.print(" Day of Week ");
  if (localTime.tm_hour >= 12){
  stundenpixel = localTime.tm_hour + 48;
  }
  if (localTime.tm_hour < 12){
    stundenpixel = localTime.tm_hour + 60;
  }
  if (localTime.tm_min == 0){
    minutenpixel = 60;
  }
  else{
    minutenpixel = localTime.tm_min;
  }
  
  
  if (localTime.tm_hour >= 7){
    if (localTime.tm_hour <= 18){
      helligkeit = 150;
    }
    else {
    helligkeit = 50;
    }
  }
  else {
    helligkeit = 50;
  }
  if (localTime.tm_wday == 0)   Serial.println(7);
  else Serial.println(localTime.tm_wday);
}